Members of the One October entry, made up of first responders and survivors of the Oct. 1 shooting on the Strip, acknowledge the crowd during the Helldorado Days parade in downtown Las Vegas Saturday, May 12, 2018. K.M. Cannon Las Vegas Review-Journal @KMCannonPhoto

Members of the Mekel's Performing Arts Academy march in the Helldorado Days parade in downtown Las Vegas Saturday, May 12, 2018. K.M. Cannon Las Vegas Review-Journal @KMCannonPhoto

Members of the One October entry, made up of first responders and survivors of the Oct. 1 shooting on the Strip, march in the Helldorado Days parade in downtown Las Vegas Saturday, May 12, 2018. K.M. Cannon Las Vegas Review-Journal @KMCannonPhoto

The parade’s roughly 100 entries included horse clubs, motorcycle clubs, marching bands, dance groups and Las Vegas residents with a May 15 birthday, also the date of the city’s founding. They were invited to march together as part of the “5/15” club.